Re: [PATCH v4 1/4] siphash: add cryptographically secure hashtable function

From: kbuild test robot
Date: Wed Dec 14 2016 - 23:24:29 EST

Hi Jason,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.9 next-20161215]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Jason-A-Donenfeld/siphash-add-cryptographically-secure-hashtable-function/20161215-095213
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 6.2.0
reproduce:
wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=ia64

Note: the linux-review/Jason-A-Donenfeld/siphash-add-cryptographically-secure-hashtable-function/20161215-095213 HEAD 3e343f4316f94cded0d1384cf35957fd51dbbc28 builds fine.
It only hurts bisectibility.

All error/warnings (new ones prefixed by >>):

In file included from include/linux/linkage.h:6:0,
from include/linux/kernel.h:6,
from lib/siphash.c:12:
>> lib/siphash.c:152:15: error: 'siphash24_unaligned' undeclared here (not in a function)
EXPORT_SYMBOL(siphash24_unaligned);
^
include/linux/export.h:58:16: note: in definition of macro '___EXPORT_SYMBOL'
extern typeof(sym) sym; \
^~~
>> lib/siphash.c:152:1: note: in expansion of macro 'EXPORT_SYMBOL'
EXPORT_SYMBOL(siphash24_unaligned);
^~~~~~~~~~~~~

vim +/siphash24_unaligned +152 lib/siphash.c

6 * https://131002.net/siphash/
7 *
8 * This implementation is specifically for SipHash2-4.
9 */
10
11 #include <linux/siphash.h>
> 12 #include <linux/kernel.h>
13 #include <asm/unaligned.h>
14
15 #if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
16 #include <linux/dcache.h>
17 #include <asm/word-at-a-time.h>
18 #endif
19
20 static inline u16 le16_to_cpuvp(const void *p)
21 {
22 return le16_to_cpup(p);
23 }
24 static inline u32 le32_to_cpuvp(const void *p)
25 {
26 return le32_to_cpup(p);
27 }
28 static inline u64 le64_to_cpuvp(const void *p)
29 {
30 return le64_to_cpup(p);
31 }
32
33 #define SIPROUND \
34 do { \
35 v0 += v1; v1 = rol64(v1, 13); v1 ^= v0; v0 = rol64(v0, 32); \
36 v2 += v3; v3 = rol64(v3, 16); v3 ^= v2; \
37 v0 += v3; v3 = rol64(v3, 21); v3 ^= v0; \
38 v2 += v1; v1 = rol64(v1, 17); v1 ^= v2; v2 = rol64(v2, 32); \
39 } while(0)
40
41 /**
42 * siphash - compute 64-bit siphash PRF value
43 * @data: buffer to hash, must be aligned to SIPHASH_ALIGNMENT
44 * @size: size of @data
45 * @key: key buffer of size SIPHASH_KEY_LEN, must be aligned to SIPHASH_ALIGNMENT
46 */
47 u64 siphash(const u8 *data, size_t len, const u8 key[SIPHASH_KEY_LEN])
48 {
49 u64 v0 = 0x736f6d6570736575ULL;
50 u64 v1 = 0x646f72616e646f6dULL;
51 u64 v2 = 0x6c7967656e657261ULL;
52 u64 v3 = 0x7465646279746573ULL;
53 u64 b = ((u64)len) << 56;
54 u64 k0 = le64_to_cpuvp(key);
55 u64 k1 = le64_to_cpuvp(key + sizeof(u64));
56 u64 m;
57 const u8 *end = data + len - (len % sizeof(u64));
58 const u8 left = len & (sizeof(u64) - 1);
59 v3 ^= k1;
60 v2 ^= k0;
61 v1 ^= k1;
62 v0 ^= k0;
63 for (; data != end; data += sizeof(u64)) {
64 m = le64_to_cpuvp(data);
65 v3 ^= m;
66 SIPROUND;
67 SIPROUND;
68 v0 ^= m;
69 }
70 #if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
71 if (left)
72 b |= le64_to_cpu((__force __le64)(load_unaligned_zeropad(data) & bytemask_from_count(left)));
73 #else
74 switch (left) {
75 case 7: b |= ((u64)data[6]) << 48;
76 case 6: b |= ((u64)data[5]) << 40;
77 case 5: b |= ((u64)data[4]) << 32;
78 case 4: b |= le32_to_cpuvp(data); break;
79 case 3: b |= ((u64)data[2]) << 16;
80 case 2: b |= le16_to_cpuvp(data); break;
81 case 1: b |= data[0];
82 }
83 #endif
84 v3 ^= b;
85 SIPROUND;
86 SIPROUND;
87 v0 ^= b;
88 v2 ^= 0xff;
89 SIPROUND;
90 SIPROUND;
91 SIPROUND;
92 SIPROUND;
93 return (v0 ^ v1) ^ (v2 ^ v3);
94 }
95 EXPORT_SYMBOL(siphash);
96
97 #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
98 /**
99 * siphash - compute 64-bit siphash PRF value, without alignment requirements
100 * @data: buffer to hash
101 * @size: size of @data
102 * @key: key buffer of size SIPHASH_KEY_LEN, must be aligned to SIPHASH_ALIGNMENT
103 */
104 u64 siphash_unaligned(const u8 *data, size_t len, const u8 key[SIPHASH_KEY_LEN])
105 {
106 u64 v0 = 0x736f6d6570736575ULL;
107 u64 v1 = 0x646f72616e646f6dULL;
108 u64 v2 = 0x6c7967656e657261ULL;
109 u64 v3 = 0x7465646279746573ULL;
110 u64 b = ((u64)len) << 56;
111 u64 k0 = le64_to_cpuvp(key);
112 u64 k1 = le64_to_cpuvp(key + sizeof(u64));
113 u64 m;
114 const u8 *end = data + len - (len % sizeof(u64));
115 const u8 left = len & (sizeof(u64) - 1);
116 v3 ^= k1;
117 v2 ^= k0;
118 v1 ^= k1;
119 v0 ^= k0;
120 for (; data != end; data += sizeof(u64)) {
121 m = get_unaligned_le64(data);
122 v3 ^= m;
123 SIPROUND;
124 SIPROUND;
125 v0 ^= m;
126 }
127 #if defined(CONFIG_DCACHE_WORD_ACCESS) && BITS_PER_LONG == 64
128 if (left)
129 b |= le64_to_cpu((__force __le64)(load_unaligned_zeropad(data) & bytemask_from_count(left)));
130 #else
131 switch (left) {
132 case 7: b |= ((u64)data[6]) << 48;
133 case 6: b |= ((u64)data[5]) << 40;
134 case 5: b |= ((u64)data[4]) << 32;
135 case 4: b |= get_unaligned_le32(data); break;
136 case 3: b |= ((u64)data[2]) << 16;
137 case 2: b |= get_unaligned_le16(data); break;
138 case 1: b |= data[0];
139 }
140 #endif
141 v3 ^= b;
142 SIPROUND;
143 SIPROUND;
144 v0 ^= b;
145 v2 ^= 0xff;
146 SIPROUND;
147 SIPROUND;
148 SIPROUND;
149 SIPROUND;
150 return (v0 ^ v1) ^ (v2 ^ v3);
151 }
> 152 EXPORT_SYMBOL(siphash24_unaligned);
153 #endif

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